Door latch



1,636,868. y 1927- w. SCHLEGEL DOOR LATCH Filed Jan. 2. 1926 2 Sheets-Sheet 1 y 1927' w. SCHLEGEL DOOR LATCH Filed Jan. 2. 19

2 Sheets-Sheet 2 1M WWI/M if' Patented July 26, 1927.

. UNITED STATES 1,636,868 PATENT OFF-ICE.

WERNER SCHLEGEL, 0F PEGAU, GERMANY;

noon LATCH.

Application filed January 2, 1926, Serial No. 78 ,985, and in Germany il'anuary 7, 1925.

This invention relates to a spring-bolt latch which is especially designed for the doors of vehicles and presents the advantage that the spring-bolt, which serves at the same time as latch-bolt, the opening and closing movement is imparted by a single two-armed bolt-nut, one of the arms of the nut serving merely to pull the bolt back into the latch, the other arm serving to push the bolt, which has engaged with the bolt-nap, further out of the latch to complete the looking and to pull it partly back into the latch it the bolt has to serve as latch bolt.

An embodiment of the invention is shown, by way of example, in the accompanying drawing in which Fig. 1 shows the bolt nut in the position which it occupies at the normal position of the bolt.

Fig. 2 shows the osition of the nut if the bolt is in the loc ing position.

Fig. 3 shows the door lock, the bolt being completely pulled back into the latch.

Figs. 4 and 5 show a modified construction of the door latch, the bolt being'shown in Fig. 4: adjusted to serve as latch bolt and in Fig. 5 pulled back into the latch.

Referring to the drawings the nut 06 has two arms b d. The arm I) engages with a long notch g of the bolt hso that it is capable of pushing the bolt 6 back into the latch inopposition to the action of thespring f.

In order to prevent yielding of the bolt at the backward movement with regard to the tumbler and to the nut which is at rest long notches n and g are provided. The other arm d of the bolt nut a engages with an indentation p of the bolt k and lifts at this movement the tumbler In which dropping intothe notch m of the advanced bolt locks the bolt in the locking position (Fig. 2). In any of the twopositions (Fig. 1

and Fig. 2) the bolt nut is securely held in.

its position by the action of the spring u bearing against the flat face 8 or t of the nut. The door latch constructed as described resents, in comparisonwith thelatches of own construction specially used for the locking of vehicle doors, the advantage that no .key is required for adjusting the bolt into the locking position.

The form of construction shown in Figs. 4 and 5 presents the further advantage that the bolt 7:. adopts automatically the locking position if the door is slammed. This is essentially obtained by the fact that the bolt nut has, besides the two arms designed to operate the bolt, a third, downwardly directed arm which, by the action of the spring, is pressed against a shoulder of an auxiliary bolt which, if the door is slammed, is displaced, in the same manner as the main bolt, in inward direction so that its extension or shoulder moves away from the downwardly directed arm of the boltnut so that the main bolt, which had been held by one of the two upper arms of the nutin the latch-position, can move into the locking position in drawing along the bolt nut, e. g. the main bolt is automatically pushed in out ward direction by the commonly used spring of the required distance. W hen the door is unlocked by a bolt key the two upper arms of the latch nut, act in the same manner as in Figs. 1 and 3 to pull the main bolt back into the latch. The downwardly directed third arm of the bolt, nut bears upon the shoulder of the auxiliary bolt, which is yieldable, so that the lower arm of the bolt nut can get in front of said shoulder whereby the bolt nut is secured again in such a posltion that its corresponding upper arm secures the main bolt in thelatch position.

The bolt nut a has, besides the two upwardly projecting arms I) and s engaging with notches g and p of the main bolt /1, a third downwardly directed arm 7" which, the door being open, bears against a shoulder 0 of an auxiliary bolt '0 so that the bolt nut is securely held in the position shown in Fig. 1, the main bolt 71. being capable of executing only a latch movement.

If the door is slammed the main bolt h as well as the auxiliary bolt 6) are pushed inwards wherefrom results that the shoulder act the auxiliary bolt '0 moves out of the range ofthe arm 1' (Fig. 5) so that the bolt nut executes, under the pressure of spring n), such a rotation that its arm 03 lifts the tumbler is out of the long notch 11. and the mainbolt k can be pushed by the action of spring f into the bolting position. At this movement the arm d of the bolt nut comes into engagement with the indentation p of the main bolt so that the main bolt can be unlocked, exactly as in the form of construotion Figs. 1 to 3, by a rotation ofthe same comes first into contact with the upper surface of the shoulder o of the auxiliarybolt 1 so that the rear end of this auxiliary bolt is pressed down in opposition to the pressure of the spring 2' owing to an upwardly directed enlargement 2 of the gu de slot a. A pin :0 PIOJGGtlIIg into the guide slot 2 serves together with this guide slot 2 of the auxiliary bolt 22 to limit the movement. The head of the auxiliary bolt 4) is bevelled in both directions so that it is pushed inward through the bolt-nap at the shutting of the door as well as at the opening of the same.

It is not absolutely necessary that the rear portion of the auxiliary bolt '0 be movable in vertical direction. The arm r of the nut might be brought into engagement with the shoulder 0 by mounting this shoulder yieldably on the auxiliary'bolt, for instance in the shape of a spring-controlled bolt with head bevelled on one side, in the shape of a hook shaped sprin or the like.

In order that t e bolt nut a be rotated around its axis by the spiral spring to of the amount necessary for the locking movement of the main bolt h the spring to is pushed over a rod 2 curved in arc shape and traversing a conveniently shaped bore of the arm 1" of the nut, said rod being fixed on a block 3.

I claim:

1. A spring-bolt latch comprising in combination a bolt designed to serve as latch bolt and as looking bolt and having a long notch and an indentation in its lower edge and a long notch and an indentation in its upper edge, a springcontrolled tumbler nor-' mally engaging with said long notch in the upper edge of said bolt, a spring controlled bolt nut rotatably mounted under said bolt, two arms upwardly projecting from said bolt nut one at the front end and the other at the rear end said first arm engaging normally with said long notch in the lower edge of said bolt so that this bolt if serving as latch bolt is secured by said tumbler engaging with said long notch in the upper edge of said bolt, and a downwardly directed extension of said tumbler extending behind said bolt so that if said latch is rotated said second arm of said latch nut enga 'ng with the indentation in the lower edgeo said bolt lifts said extension and through it said tumbler and advances said bolt intothe locking position said tumbler coming then into engagement with said indentation in the upper end of said bolt to securely hold said bolt in the locking position.

2. A spring-bolt latch comprising in combination a bolt designed to serve as latch bolt and as locking bolt and having in its lower edge a long notch and an indentation, a rotatablebolt nut, two upwardly directed arms of said bolt nut one arm serving to pull said bolt back intothe latch and the other .to push the bolt into the locking position 1,ese,eee

and to pull it out of the locking position into the latch position, an auxiliary bolt in the lower partof the latch, a shoulder of said auxiliary lock, a third downwardly directed arm of said nut, a spring pressing said third arm against said shoulder of the. auxiliary bolt if the door is open so that through the intermediary of the right upper arm of said nut the main bolt is securely held in the latch position said auxiliary bolt being automatically pushed inward if the door is slammed so that said shoulder liberates said third arm of said nut and said main bolt can move into the locking position.

3. A spring-bolt latch comprising in combination a bolt designed to serve as latch bolt and as looking bolt and having in its lower edge a long notch and an indentation, a rotatable bolt nut, two upwardly directed arms of said bolt nut one arm servin to pull said bolt back into the latch and the other to push the bolt into the locking position and to pull it out of the locking position into the latch position, an auxiliary bolt in the lower part of the latch having a guide slot in its rear part said slot having an upwardly directed enlargement, a shoulder o said auxiliary bolt, a third downwardly directed arm of said nut, a spring pressing said third arm against said shoulder of the auxiliary bolt if the door is open so that through the intermediary of the right upper arm of said nut the main bolt is securely held in the latch position said auxiliar bolt being automatically pushed inward 1f the door is slammed so that said shoulder liberates said third arm of said nut and said main bolt can move into the locking position,

and a spring pressing on the lower surface I of said auxiliary bolt said spring being compressed if at the unlocking of the door said third arm of said nut presses the lower end of said auxiliary bolt down before said third arm comes into engagement with said shoulder.

4:. A spring-bolt latch comprising in combination a bolt designed to serve as latch bolt and as looking bolt and having in its lower edge a long notch and an indentation,

a rotatable bolt nut, two upwardly directed arms of said bolt nut one arm serving to pull said bolt back into the latch and the other to push the bolt into the locking position I and to pull it out of the lockin position into the latch position, an auxi ia'ry bolt in the lower part of the latch, a spring-controlled shoulder movably mounted on said auxiliary bolt, a third downwardly directed arm of said nut, a spring pressing said third arm against said shoulder of the auxiliary bolt if the door is open so that through the intermediary of the right upper arm of said nut the main bolt is securely held in' the latch position said auxiliary bolt being automatically pushed inward if the door is slammed so that said shoulder libeiyates said thirdarm of said nut and said mam bolt can move into the lockin osition.

5. A spring-golt latch comprising in combination a bolt designed to serve as latch bolt and as looking bolt and having in itslower edge a long notch and an indentation, a rotatable bolt nut, two upwardly directed arms of said bolt nut one arm serving to pull said bolt back into the latch and the other to push the bolt into the locking position and to pull itout of the locking position into the latch position, an auxiliary bolt in the lower part of the latch, a shoulder of said auxiliary bolt, :1 third downwardly directed arm of said nut, said third arm having an arc-shaped boring, an arc-shaped rod fixed at one end in the latch case and projecting at the other end through said bormg of said third arm of the nut a spiral sprin on said rod between said third arm and t e fixed end of said rod pressing said third arm against said shoulder of the' main bolt can move into the locking position.

WERNER SCHLEGEL. 

